In the odd nights from the last ten
– this is the night of the 21st and the 23rd and the 25th and the 27th and the 29th

The Mother of the Believers ‘Aaishah radi Allaahu ‘anhaa informed that the Prophet sall Allaahu ‘alaihi wa sallam directed (us) to seek to encounter laylat ul qadr with righteous deeds and standing (in prayer) in it during the odd nights of the last ten of Ramadaan.